//
//  DrawerViewController.m
//  LO_MUSIC
//
//  Created by lanou3g on 16/2/24.
//  Copyright © 2016年 杨少锋. All rights reserved.
//

#import "DrawerViewController.h"

@interface DrawerViewController ()<UIGestureRecognizerDelegate>

@end

@implementation DrawerViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    

    //如果没有手势
    if (!self.tap) {
        
        self.tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction)];
        [self.tap setEnabled:NO];

        self.tap.delegate = self;
        [self.view addGestureRecognizer:self.tap];
    }
    
    
}

//设置中间视图控制器

- (void)setRootViewController:(UIViewController *)viewcontroller{
    //如果传进来的viewcontroller是空的直接返回
    if (!viewcontroller) {
        return;
    }
    //设置中间视图控制器
    [self.rootVC.view removeFromSuperview];
    self.rootVC = viewcontroller;
    [self addChildViewController:viewcontroller];
  
        //如果交互开着,证明抽屉是打开的
        if (self.tap.enabled) {
            viewcontroller.view.frame = CGRectMake(260, 0, 375, 667);
        }
   
    [self.view addSubview:viewcontroller.view];
    
    //关闭抽屉
    [self showRootViewController:nil];
    //设置导航栏
    [self setNaButton];
    
}

//展示中间视图的方法(关闭抽屉)

- (void)showRootViewController:(UIViewController *)viewcontroller{
    
    [UIView animateWithDuration:0.4 animations:^{
       
        self.rootVC.view.frame = CGRectMake(0, 0, 375, 667);
    }];
    
    //手势关掉
    [self.tap setEnabled:NO];
    //rootView交互打开
    self.rootVC.view.userInteractionEnabled = YES;

}

//打开抽屉
- (void)showLeftViewController:(UIViewController *)leftViewcontroller{

    
    if (![self.view .subviews containsObject:self.leftVC.view]) {
        //插入抽屉的view
        [self.view insertSubview:self.leftVC.view atIndex:0];
    }
    //动画移动根视图控制器
    [UIView animateWithDuration:0.8 animations:^{
       
        self.rootVC.view.frame = CGRectMake(260, 0, 375, 667);
    }];
    
    //手势打开
    [self.tap setEnabled:YES];
    //rootView禁止使用
    self.rootVC.view.userInteractionEnabled = NO;
    
}


//设置左上角按钮

- (void)setNaButton {
    
    UINavigationController *na = (UINavigationController *)self.rootVC;
    
    UIViewController *vc = na.viewControllers[0];
    
    vc.navigationItem.leftBarButtonItem = ({
        UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithTitle:@"菜单" style:(UIBarButtonItemStyleDone) target:self action:@selector(openMenu)];
        item;
    });
    
    
}

//打开抽屉

-(void)openMenu{
    
    [self showLeftViewController:nil];
    [self.tap setEnabled:YES];
    self.rootVC.view.userInteractionEnabled = NO;
}

-(void)tapAction{
    //关闭抽屉
    [self showRootViewController:nil];
    //
    [self.tap setEnabled:NO];
}


//delegate

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    
    if (gestureRecognizer == self.tap) {
        
        return CGRectContainsPoint(self.view.frame, [gestureRecognizer locationInView:_rootVC.view]);
    }
    
    return YES;
}

@end
